rtl88x2CE_WiFi_linux driver

hc

2024-05-10 cde9070d9970eef1f7ec2360586c802a16230ad8

 kernel/arch/powerpc/kernel/vdso64/sigtramp.S
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@@ -1,15 +1,12 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * Signal trampoline for 64 bits processes in a ppc64 kernel for
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  * use in the vDSO
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  *
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  * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp.
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  * Copyright (C) 2004 Alan Modra (amodra@au.ibm.com)), IBM Corp.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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  */
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+#include <asm/cache.h>		/* IFETCH_ALIGN_BYTES */
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 #include <asm/processor.h>
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 #include <asm/ppc_asm.h>
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 #include <asm/unistd.h>
..
..
@@ -18,21 +15,26 @@
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 	.text
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-/* The nop here is a hack.  The dwarf2 unwind routines subtract 1 from
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-   the return address to get an address in the middle of the presumed
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-   call instruction.  Since we don't have a call here, we artificially
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-   extend the range covered by the unwind info by padding before the
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-   real start.  */
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-	nop
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+/*
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+ * __kernel_start_sigtramp_rt64 and __kernel_sigtramp_rt64 together
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+ * are one function split in two parts. The kernel jumps to the former
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+ * and the signal handler indirectly (by blr) returns to the latter.
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+ * __kernel_sigtramp_rt64 needs to point to the return address so
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+ * glibc can correctly identify the trampoline stack frame.
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+ */
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 	.balign 8
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+	.balign IFETCH_ALIGN_BYTES
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+V_FUNCTION_BEGIN(__kernel_start_sigtramp_rt64)
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+.Lsigrt_start:
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+	bctrl	/* call the handler */
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+V_FUNCTION_END(__kernel_start_sigtramp_rt64)
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 V_FUNCTION_BEGIN(__kernel_sigtramp_rt64)
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-.Lsigrt_start = . - 4
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 	addi	r1, r1, __SIGNAL_FRAMESIZE
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 	li	r0,__NR_rt_sigreturn
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 	sc
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 .Lsigrt_end:
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 V_FUNCTION_END(__kernel_sigtramp_rt64)
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-/* The ".balign 8" above and the following zeros mimic the old stack
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+/* The .balign 8 above and the following zeros mimic the old stack
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    trampoline layout.  The last magic value is the ucontext pointer,
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    chosen in such a way that older libgcc unwind code returns a zero
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    for a sigcontext pointer.  */